| J.B. Mackenzie (Holdings) Limited | Professional & scientific | 1946 |
| J.B.M. Taxis Ltd. | Professional & scientific | 1999 |
| J.B.Mcbean Limited | Transport & logistics | 1978 |
| J.E.Devereux Ltd | Wholesale & retail | 2013 |
| J.Esthetic LP | | 2017 |
| J.F. Finlay & Company Limited | Wholesale & retail | 1958 |
| J.G. Taxis Ltd. | Professional & scientific | 2001 |
| J.G. Thomson & Co. Limited | Manufacturing | 2017 |
| J.H. Carruthers Limited | Extraterritorial | 1981 |
| J.H. Hutchison Taxis Ltd. | Extraterritorial | 2000 |
| J.H. Taxis Ltd. | Transport & logistics | 1998 |
| J.J Construction Edinburgh Ltd | Construction | 2016 |
| J.J. Jacobsen L.P. | | 2009 |
| J.L.T. NO1 Ltd | Extraterritorial | 2012 |
| J.M Worldwide Investment LP | | 2017 |
| J.O.N.A. Global Operations LP | | 2016 |
| J.P. Morgan G1 (GP Scots) Limited | Administrative & support | 2010 |
| J.P. Morgan G2 GP LP | | 2015 |
| J.S. Main & Sons Ltd | Wholesale & retail | 2016 |
| J.S. Mason Plumbers Ltd | Construction | 2025 |
| J.S. Smith Laboratories & Co | | 1990 |
| J.S. Taxis Ltd. | Professional & scientific | 1999 |
| J.S.K Construction Services Ltd. | Construction | 2005 |
| J.W & J.W Developments Ltd. | Construction | 2016 |
| J.W. Glazing Limited | Construction | 1985 |
| J.W. Taxis (Two) Ltd. | Other services | 2001 |
| J.W.Lilly Publishing Ltd | Information & communication | 2026 |
| J2 Associates Ltd | Professional & scientific | 2020 |
| J2-1K Ltd | Hospitality | 2026 |
| J4 Storage Ltd | Transport & logistics | 2019 |
| J4DPE NO1 Ltd | Extraterritorial | 2012 |
| J4G Tuscany 1 | | 2008 |
| J5 Developments Ltd | Hospitality | 2016 |
| JA Fife Ltd | Administrative & support | 2018 |
| JA Reid Limited | Hospitality | 2011 |
| Jaac Properties Limited | Real estate | 2026 |
| Jaallan Limited | Manufacturing | 2018 |
| Jaan Limited | Wholesale & retail | 2026 |
| Jaap Photo Ltd. | Administrative & support | 2003 |
| Jabalpur LP | | 2003 |
| Jabbal&Jabbal Limited | Health & social care | 2017 |
| JAC Analysis Ltd. | Professional & scientific | 1999 |
| JAC Solutions Ltd | Real estate | 2022 |
| JAC Trades Ltd | Construction | 2020 |
| Jacalai Ltd | Wholesale & retail | 2023 |
| Jacare Studio Ltd | Professional & scientific | 2026 |
| Jack Alexander Legal Ltd | Professional & scientific | 2026 |
| Jack Brown Limited | Wholesale & retail | 1987 |
| Jack Car Detailing Ltd | Wholesale & retail | 2023 |
| Jack Christie Consulting Ltd | Other services | 2022 |
| Jack Harding Photography Limited | Professional & scientific | 2019 |
| Jack Paint & Decoration Ltd | Construction | 2025 |
| Jack Property Holdings Limited | Real estate | 2015 |
| Jack Property Investments Limited | Other services | 2017 |
| Jack Sports Holdings Ltd | Financial services | 2026 |
| Jack Ventures Limited | Real estate | 2013 |
| Jack Verran Design Ltd | Professional & scientific | 2024 |
| Jack Welding Ltd | Construction | 2025 |
| Jack Winston Ltd | Wholesale & retail | 2020 |
| Jackfitz Ltd | Health & social care | 2023 |
| Jacko Builders (Edinburgh) Ltd | Construction | 2013 |
| Jackpot Future SP | | 2001 |
| Jackrabbit of Edinburgh Ltd | Wholesale & retail | 2025 |
| Jacks Investments Limited | Education | 2024 |
| Jackson Management (Edinburgh) Limited | Real estate | 2010 |
| Jackson Murray Limited | Professional & scientific | 2007 |
| Jackstay Sailing Ltd | Arts & recreation | 2018 |
| Jacobes AFS Ltd | Financial services | 2017 |
| Jacobs & Co | | 1991 |
| Jacobs & Co | | 2007 |
| Jacobsen Bathrooms Ltd | Construction | 2023 |
| Jacques Couty Joinery & Building Ltd | Construction | 2025 |
| Jacqui Laurie Women's Health Limited | Health & social care | 2024 |
| Jacvale Trade LP | | 2012 |
| Jadalo Management Ltd | Extraterritorial | 2012 |
| Jade Garden (Prestonpans) Limited | Hospitality | 2003 |
| Jade Gardens Property Co. Ltd. | Real estate | 2001 |
| Jade House Chen Ltd | Hospitality | 2024 |
| Jade Rebecca Group Ltd | Other services | 2023 |
| Jade Takeaway Limited | Hospitality | 2023 |
| Jadebase Development LP | | 2013 |
| Jaded.Hairroom Ltd | Other services | 2025 |
| Jadenorth Properties Limited | Real estate | 2000 |
| Jadewaven Ltd | Wholesale & retail | 2025 |
| Jadify Limited | Wholesale & retail | 2025 |
| Jadler Industries LP | | 2014 |
| Jafa Ltd | Professional & scientific | 2024 |
| Jaffs Bar and Restaurant Limited | Hospitality | 2017 |
| JAG Investment Management Ltd | Extraterritorial | 2012 |
| JAG Media Ltd | Information & communication | 2019 |
| JAG Nexus Limited | Administrative & support | 2026 |
| JAG Residential Ltd | Households | 2026 |
| JAG Technology Consulting Limited | Professional & scientific | 2008 |
| Jagg Development Ltd | Construction | 2018 |
| Jaggy Bunnet Productions Ltd | Information & communication | 2025 |
| Jaggy Edina Productions Ltd | Arts & recreation | 2026 |
| Jagodine Limited | Manufacturing | 2019 |
| Jaguarete LP | | 2025 |
| Jagwitch Limited | Arts & recreation | 2014 |
| Jahan Taxi Limited | Transport & logistics | 2013 |